▎ 摘　　要

NOVELTY - A cathode material comprises calcium-germanium-oxalate nanowires, reduced graphene oxide and conductive carbon black. The calcium-germanium-oxalate nanowires are used in an amount of 50-80 wt.% based on total mass of the cathode material. The reduced graphene oxide and conductive carbon black are added in an amount of 20-50 wt.%. The mass ratio of reduced graphene oxide and conductive carbon black is 1:1-10. The calcium-germanium-oxalate nanowires are hydrated nanowires, which are encapsulated in graphene and conductive carbon black to form a three-dimensional conductive network and ion transmission channels after annealing. USE - Cathode material for lithium ion battery (claimed). ADVANTAGE - The cathode material is prepared by a simple method, and utilizes calcium-germanium-oxalate which reduces the powdering during material circulation. The cathode material utilizes reduced graphene oxide having good conductivity and conductive agent having uniform dispersion which increases the specific surface area of the material, effectively slow down the volume expansion of germanium-based materials, while providing more diffusion channels for lithium ions, thereby enhancing the electronic conductivity of the overall material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of cathode material, which involves using germanium source, isopropanol and mixed solvent of water and organic solvent; and (2) use of cathode material for lithium ion battery, which has current density of 0.1 Ag-1, capacity of 700-900 mAh/g after 100 cycles of charge and discharge and excellent rate performance.